Pump jack



Patented Dec. 10,3 179,46

PUMP JACK 2 claims. 1

This invention relates to a pump jack which may be fitted to a farm pumpof conventional type for the purpose of operating the pump either bypower derived from a motor or from awindmill or by hand, and theinventionis directed particularly to the means provided for compactlyarranging the mechanical vassembly so that it may be connectedinterchangeably, either to the reciprocating shaft of a `windmillor totherovtating power take-off'ofvan .engine or motor and effectively applythe power thus derived to a reciprocating pump rod. f Y,

Further objects and detailswill appear from a description of theinvention in conjunction with the accompanying drawing whereini Figure 1is a sectional-elevation of the pump jack mounted on a pump ofconventional type;

Fig. 2 is a side elevation of the pump jack; and

Fig. 3 is a sectional detail taken on offset line 3--3 in Fig. 1. y,

The pump jack, as shown, is mounted upon a pump I terminating in a neckII which carries the standard I2 of the pump jack. The base of thestandard encircles the neck of the pump and is held thereon by setscrews I3, and a shim ring I4 may, if necessary, be interposed betweenthe standard and the neck in cases where a tight tting of the partsrequires the use of one or more shim rings, thus adapting the jack foruse on pumps having necks of varying diameters.

The standard at its upper end terminates in a cross head I5 to which issecured a housing I6 within which the operating parts are enclosed. Thehead has fitted thereinto a sleeve I1 which furnishes a guide for areciprocating stem I8 which is secured by a coupling I9 to the pump rod20. The stem carries a rack 2| terminating in an extension 22, which isguided within a tubular cap 23 upstanding from the housing.

The rack meshes with a segment 24 carried by a sleeve 25, mounted on apintle 26, and having rigidly secured thereto an arm 21 provided with alongitudinal slot 28 Within which rides a roller 29, bearing against theface of the slotted arm. The roller is carried on a pin 30 which alsocarries the guiding washer or head 3l to ensure proper relationshipbetween the pin and the arm. The pin is radially adjustable within aslot 32 in a segmental portion of a spur gear Wheel 33, fixed on a stubshaft 34, journaled through the side Wall of the housing and carrying atits outer end a crank arm 35.

The crank arm pivots the upper end of a link 36, the lower end of whichis pivoted to the inner end of a lever 31, medially fulcrumed on a pinLouis Kessler, Oak Park, Ill., assignor to Charles J. Muntwyler, OakPark, Ill.

v Application November 18, 1943, Serial No. 510,7-83

' (ciu- 46) 38 and upturned at its outer end 39 to make connection, whendesired, with the lower end rof a reciprocating windmill shaft y4I),which will impart rotation through the crank to the spur gear, thusoscillating the segment 24,l whichmeshes with the rack connected withthe pump rod.;v

Power is alternately derived rvfrom a rotating pulley (not shown) on amotor or engine which connects with a pulley 4I on shaft 42journaledthrough the side walls of the housing,.which shaft has slidably keyedthereon a, pinion43,

having a grooved hub 44,` engaged bythe inner end of a pivoted clutchlever 45, vwhich maybe moved, either to engage the pinion with thegearwheel 33, or to breakthe engagement when itis desired to derive powerfrom the windmill.L In order to hold the teethof the rack 2Ifinto firmengagement with the teethrof the segment 24,:the rack is backedbya guidearm-4B, the foot 41 of which is screwed to a bracket. 48 secured tothewall of the housing. Y.

I Operation f I' "I t with the'pinion 43 thro'wnout vof mesh and thereciprocating windmill shaft 40 connected to lever 31, rotation will beimparted directly to the gear shaft and the rotation of the gear 33 willimpart oscillating movements t0 the segment 24 through the slotted arm21 and roller 29, thus reciprocating the rack. With the gear rotatingclockwise in Fig. 1, the lifting stroke of the pump4 increase to maximumat the medial position and thereafter decrease to zero when the rollerreaches the top position shown in Fig. 1. 'I'hus the speed of the pumpstroke will alternately accelerate and retard as the rack reaches thelimits of its range of movements so that no sudden reversals of movementwill be imparted to the pump rod.

However, although the vertical component of movement of .the roller 29increases as the medial position is approached, its movement will -beimparted to the oscillating shaft 26 `and segment 24 through anincreasingly longer section of =the slot- .ted arm 21, so that themovement imparted to the rack While travelling through the intermediateposition, with corresponding reduction in power, will not be excessiveat any stage in the stroke, but will be harmoniously proportioned tosecure the most effective action. Furthermore, variations in thetransmission of power at differthis stage, since the pump rod isunloaded and the parts are merely restored to active position.

Whenfit is desired to derive power from an engine or motor shait, thepinion 43 is thrown into mesh with the gear 33 which impartsreciprocating movements to the rack andpump rod through the train ofconnections in the manner heretofore described. Obviously, moreover, ifoccasion shouldrequire, the lever 21 can be operated manually Yinsteadof through power derived from the windmill. The invention as a, whole isof a nature which permits it to be tted as a unit to any farm pump oi'standard type and .to be operated in a manner which will effectivelyemploy power derived either Vfrom a. rotating'element, as in the case of4an engine or motor, or from a reciprocating element asin thecase of awindmill shaft or the like.

AI claim: f

Al pump jack adapted -to be fitted to a lfarm pump -and operable byeither a motor or a Windmill and ycomprising a, housing adapted `to betted toa pump having a vertically reciprocating pump rod, a verticallyslidable rack bar adapted to -be connected to the pump rod, anoscillating gear element meshing with the rackv bar and pivotallymounted at one side of the same, an arm fixed to the'vgear element andadapted Vto operate in unison therewith an-d provided with a.longitudinal slot, a rotating gear element mounted in the housing andhaving its axis spaced from .that

oi' the oscillating gear element, a crank carried by Y the rotating gearelement and operable in the slot of said arm, a horizontal crankshaft'journaled in the housing and connected with said rotating gearelement and provided with a crank arm, a lever fulcrumed intermediate ofits ends and extending beyond the housing, a, link connecting one arm ofthe lever with said crank arm, means for detachably comiectingthe otherend ofthe lever with a reciprocating actuating member of the windmill,and means for connecting the rotating gear element with a motor and fordisconnecting it therefrom including a pinion meshing with said rotatinggear element.

2. A pump jack adapted to be fitted to a farm pump and operable byeither a motor or a windmill and comprising a housing adapted to bei'ltted to la pump' having a vertically reciprocating pump rod, avertically slidable rack bar adapted 'to be connected to the pump rod,an oscillating gear element meshing with the rack bar and pivotallymounted at one side of the same, an arm fixed to the gear element and'adapted to operate in unison therewith and provided with'a,longitudinal slot, a rotating gear element mounted inthe housing andhaving its axis spaced from that o f the oscillating gear element, acrank carjried by the rotating gear 'element and operable in the slotoi"sai lfarn'1, a horizontal crank shaft `iournaled in the housing andconnected with-said rotating gear element and provided with a crank arm,a lever Vfulcrumed interrnediateof its ends and extending beyond thehousing, a link connecting one arm-oi' the lever with said crank arm,means for detachably'connecting the other end of the lever with areciprocating actuating member of the windmill, a driving shaftjournaled in the casing, a gear fixed to the driving shaft and meshingwith the rotating gear element, a pulley adapted to be connected withand actuated by a motor, and means including a clutch for connecting thepulley with the driving vshaft and for disconnecting it therefrom. n

LOUIS KESSLER..

